Question 534804
According to a recent survey, Americans get a mean of seven hours sleep per night. 
A random sample of 50 students a West Virginia University revealed the mean number of hours slept last night was 6 hours and 48 minutes (6.8 hours). 
-----
The standard deviation of the sample was 0.9 hours. 
-------------
Is it reasonable to conclude that the students a West Virginia sleep less than the typical American?
Ho: u >= 7 hrs
Ha: u < 7 (claim)
--------------------------
z(6.8) = (6.8-7)/[0.9/sqrt(50)] = -1.5713
-----
p-value = P(z < -1.5713) = 0.0581
-----
Conclusion: Since the p-value is greater than 5%,
fail to reject Ho.
The test results to not support the claim.
==================
Cheers,
Stan H.
==================